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88 Portal axes with ball screw drive
9 Glossary PAS4•S
MNA1MLSDM00EN, V2.01, 07.2009
Portal axis Generic term for driven axes and support axes. In the case of a portal
axis, the axis body is stationary while the carriage moves. Cantilever
axes work the other way round.
Positioning accuracy Positioning accuracy is the tolerance between the specified position and
actual position.
Repeatability Repeatability is the accuracy with which it is possible to move to a pre-
vious position again under the same conditions.
Running accuracy Due to the manufacturing process, the extruded aluminium profiles have
a certain tolerance in terms in straightness and twist. The tolerances are
specified in EN 12020-2. To reach the desired running accuracy, the lin-
ear axis must be mounted on a precision-machined surface.
Self-locking The product is not self-locking. This means that motors with a holding
brake, a separate holding brake or suitable weight compensation for the
linear axis must be used, particularly so if axes are vertically mounted.
Sensor Inductive proximity switches are used as sensors for limit switches or ref-
erence switches. These switches are not a safety function.
Service life The service life is the distance in kilometers before the first signs of ma-
terial fatigue can be seen on the guides, the drive elements and the
bearings. Service life specifications (kilometers covered) relate to the
nominal values specified in the data sheet. If the nominal values are ex-
ceeded, the service life decreases accordingly.
Stiffness The stiffness shows information on the capacity of part that is to be po-
sitioned to move and stop at the correct position, even under load vari-
ations.
Stroke reserve The stroke reserve is the distance between a limit switch and the me-
chanical stop.
Stroke Stroke is the maximum travel of the carriage between the switching
points of the limit switches.
Support axis A support axis has a linear guide, but no drive elements. A support axis
carries loads that are applied asymmetrically to the carriage and im-
proves the stability and service life of the system.